A Simple 2D CAD/CAM application (currently Windows-only)
Cuts simple shapes (pockets, mostly) and simplified gears. It has a geometry mode that allows geometry defined by lines and arcs. It also generates geometry from any OpenType-style font!

A python gear generator that serves as CAE/CAD-preprocessor for involute gears based on pythonOCC. It allows for the computation of dynamic properties and the creation of exact geometries from a minimal input set.